发动机罩的结构轻量化设计

The Lightweight Design of the Structure of the Engine Hood

应用拓扑和形貌联合优化,以及基于DOE灵敏度分析的尺寸优化对发动机罩进行轻量化设计。分析了原发动机罩主要承载状态的刚度和一阶约束模态。两种优化设计方法均以体积最小为目标,弯曲刚度、扭转刚度、侧向刚度和一阶约束模态频率为约束条件。根据优化设计结果,给出了两种轻量化方案。对比优化前后的结构性能,从刚度和一阶约束模态频率角度验证轻量化方案的可行性。CAE分析结果表明,两种方法均可以达到降低发动机罩质量且满足结构性能要求的目的,而且,对此发动机罩尺寸优化的轻量化效果更好。

The lightweight design of the engine hood is realized by the combined topology and topography optimization and the size optimization is based on DOE sensitivity analysis. The stiffness of the main bearing state and first order constraint mode of the original engine hood are analyzed, The minimum volume is defined as the objective function. The bending stiffness, torsion stiffness, lateral stiffness and first order constraint modal frequency are defined as the constraints. According to the results of the optimization design, two lightweight schemes are proposed, Practicability of the lightweight schemes is considered by stiffness and first order constraint modal frequency. The results of the CAE analysis indicate that the optimized structure can satisfy the structure peormance requirements while the mass of the engine hood reduces by the two methods; therefore, the lightweight of the engine hood by size optimization is more effective.